File content as of revision 0:689817250cb6:

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/* 
The SDP connector is a 120 pin connector used on Analog Devices controller 
boards to interface with ADI evaluation boards, over 450 ADI evaluation boards 
utilise this connector, a list of these boards can be found at 
https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-development-platforms/sdp.html#Compatible-Boards.

The following is an example program showing how to initialise and use SDP 
connector peripherals (using SPI and GPIOs as an example) on the SDP-K1 in mbed.
Informtion on the pin name definitions for the SDP connector on the SDP-K1 can 
be found at https://os.mbed.com/platforms/SDP_K1/.
The full list of peripherals available on the SDP connector include GPIOs, 
Timers, SPI, I2C, and UART. For further information on how to enable these 
peripherals, consult the mbed documentation https://os.mbed.com/docs/mbed-os/v5.15/apis/drivers.html
*/
#include "mbed.h"
#include "platform/mbed_thread.h"

// Blinking rate in milliseconds
#define SLEEP_TIME                  500

// Initialise the digital pin LED1 as an output
DigitalOut led1(LED1);

// Initialise the serial object with TX and RX pins
Serial pc(USBTX, USBRX);

// Initialise the SDP connector SPI peripheral (mosi, miso, clk)
SPI spi(SDP_SPI_MOSI, SDP_SPI_MISO, SDP_SPI_SCK); // SDP coonector pin no. (84, 83, 82)

// SDP SPI CS A (one of 3 available chip selects on the SDP connector)
DigitalOut cs_a(SDP_SPI_CS_A); // SDP connector pin no. 85

// Initialise GPIOs, there are 8 available SDP connector GPIO's (GPIO 0-7)
DigitalOut gpio1(SDP_GPIO_1); // GPIO pin 1 - SDP connector pin no. 78
DigitalOut gpio2(SDP_GPIO_2); // GPIO pin 2 - SDP connector pin no. 44   
    
// main() runs in its own thread in the OS
int main()
{
    
    uint8_t receive;
    
    // Default chip select high
    cs_a = 1;
    
    // Setting GPIOs low initially
    gpio1 = 0;
    gpio2 = 0;
    
    while(true){
    
        // Toggling GPIOs 
        gpio1 = !gpio1;
        
        gpio2 = !gpio2;    
        
        // Set CS low for SPI write
        cs_a = 0;
        // Performing SPI write/read  (loopback if MOSI and MISO lines are connected)
        receive = spi.write(0x0A);
        // Set CS high after performing SPI write
        cs_a = 1;
        
        // Toggling GPIOs
        gpio1 = !gpio1;
        
        gpio2 = !gpio2;   
        
        // Blink LED and wait 500 ms
        led1 = !led1;
        thread_sleep_for(SLEEP_TIME);
        
    }
    
}